<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 警告框 -->
            <el-alert
                title="注意：只允许为第三级分类设置相关参数"
                type="warning"
                show-icon
                :closable="false">
            </el-alert>
            
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类: </span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
                        expand-trigger="hover"
                        v-model="selectedCateKeys"
                        :options="cateList"
                        :props="cateProps"
                        @change="handleChange"
                        >
                    </el-cascader>
                </el-col>
            </el-row>


            <!-- 配置动态参数 静态参数的页签 -->
            <el-tabs v-model="activeName" type="card" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">
                        添加参数
                    </el-button>
                    <!-- 动态参数表格 -->
                        <el-table
                            :data="manyTableData"
                            border
                            stripe
                            style="width: 100%">
                            <!-- 展开行 -->
                            <el-table-column type="expand">
                                <template slot-scope="scope">
                                    <!-- 循环渲染tag标签 -->
                                    <el-tag class="subdata" type="primary" v-for="(item,i) in scope.row.attr_vals" :key='i' closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                    <!-- 输入的文本框框 -->
                                    <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)"
                                    >
                                    </el-input>
                                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                </template>
                            </el-table-column>
                            <!-- 索引列 -->
                            <el-table-column type="index" label="#">
                            </el-table-column>
                            <el-table-column
                            prop="attr_name"
                            label="参数名称">
                            </el-table-column>
                            <el-table-column
                            label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click='showEditDialog(scope.row.attr_id)'>编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click='removeParams(scope.row.attr_id)'>删除</el-button>
                            </template>
                            </el-table-column>
                        </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                        <el-table
                            :data="onlyTableData"
                            border
                            stripe
                            style="width: 100%">
                            <!-- 展开行 -->
                            <el-table-column type="expand">
                                <template slot-scope="scope">
                                    <!-- 循环渲染tag标签 -->
                                    <el-tag class="subdata" type="primary" v-for="(item,i) in scope.row.attr_vals" :key='i' closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                    <!-- 输入的文本框框 -->
                                    <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)"
                                    >
                                    </el-input>
                                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                </template>
                            </el-table-column>
                            <!-- 索引列 -->
                            <el-table-column type="index" label="#">
                            </el-table-column>
                            <el-table-column
                            prop="attr_name"
                            label="属性名称">
                            </el-table-column>
                            <el-table-column
                            label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click='showEditDialog(scope.row.attr_id)'>编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click='removeParams(scope.row.attr_id)'>删除</el-button>
                            </template>
                            </el-table-column>
                        </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog @close="addDialogClosed"
            :title='"添加"+titleText'
            :visible.sync="addDialogVisible"
            width="50%">
            <!-- 添加参数的对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" class="demo-ruleForm">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        
        <!-- 修改参数的对话框 -->
        <el-dialog @close="editDialogClosed"
            :title='"修改"+titleText'
            :visible.sync="editDialogVisible"
            width="50%">
            <!-- 添加参数的对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" class="demo-ruleForm">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editparams">确 定</el-button>
            </span>
        </el-dialog>
    </div>    
</template>

<script>
export default {
    data(){
        return {
            // 商品分类列表
            cateList:[],
            // 级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName:'many',
            // 动态参数的数据
            manyTableData:[],
            // 静态参数的数据
            onlyTableData:[],
            // 控制添加对话框的显示与隐藏
            addDialogVisible:false,
            addForm:{attr_name:''},
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'},]         
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible:false,
            editForm:{},
            // 修改表单的验证规则对象
            editFormRules:{
                attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'},]         
            },
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类失败')
            }
            this.cateList=res.data
            console.log(this.cateList);
        },
        //级联选择框选中调用
        handleChange(){
            this.getParamsData()
        },
        // Tab
        handleTabClick(){
            console.log(this.activeName);
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData(){
            if(this.selectedCateKeys.length!==3){
                // 选择的不是三级分类
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return 
            }
            // 选择的是三级分类
            console.log(this.selectedCateKeys)
            // 根据所选分类的id和当前所处的面板 获取对应的参数
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error('获取参数列表失败')
            }
            console.log(res.data);
            res.data.forEach(item=>{
                item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[]
                // 添加一个bool 控制文本框的显示与隐藏
                item.inputVisible=false
                // 文本框中输入的值
                item.inputValue=''
            })
            console.log(res.data);
            if(this.activeName==='many'){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
        },
        // 添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 点击添加按钮函数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid){
                    return
                }
                const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{attr_name:this.addForm.attr_name,
                attr_sel:this.activeName})
                if(res.meta.status!==201){
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.getParamsData()
                this.addDialogVisible=false
            })
        },
        // 点击按钮修改的对话框
        async showEditDialog(attr_id){
            // 查询当前参数的信息
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error('获取参数信息失败')
            }
            this.editForm=res.data
            this.editDialogVisible=true
        },
        // 重置修改表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮修改操作信息
        editparams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return
                const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                {attr_name:this.editForm.attr_name,attr_sel:this.activeName})
                if(res.meta.status!==200){
                    return this.$message.error('修改参数信息失败')
                }
                this.$message.success('修改参数信息成功')
                this.getParamsData()
                this.editDialogVisible=false
            })
        },
        // 根据id删除对应的参数项
        async removeParams(id){
            const confirmRsult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err=>err)
            if(confirmRsult!=='confirm'){
                return this.$message.info('已取消删除')
            }
            console.log('确认删除');
            const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
            if(res.meta.status!==200){
                return this.$message.error('删除参数失败')
            }
            this.$message.success('删除参数成功')
            this.getParamsData()
        },
        // 文本框失去焦点 或按下了enter 都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                row.inputVisible=false
                return
            }
            // 如果没有return则证明输入了内容 需要后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            this.saveAttrVals(row)
        },
        // 点击按钮 展示文本输入框
        showInput(row){
            row.inputVisible=true
            // 自动获得焦点 $nextTick方法的作用 就是当页面上元素被重新渲染之后才会执行回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            })
        },
        // 将对attr_vals的操作保存到数据库
        async saveAttrVals(row){
            // 需要发起请求 向数据库保存操作
            const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status!==200){
                return this.$message.error('修改参数失败')
            }
            this.$message.success('修改参数成功')
        },
        // 删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    computed:{
        // 如果按钮需要被禁用 则返回true 否则返回length
        isBtnDisabled(){
            if(this.selectedCateKeys.length!==3){
                return true
            }
            return false
        },
        // 当前选择的三级分类id
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName==='many'){
                return '动态参数'
            }else{
                return '静态属性'
            }

        }
    }
}
</script>

<style lang="less" scoped>
    .cat_opt{
        margin: 15px 0; 
    }

    .input-new-tag{
        width: 120px;
    }

    .subdata{
        margin: 0 20px;
    }
</style>